Information Systems Security Engineer (ISSE)

CACI • Sterling, VA

9h • Onsite

About The Position

We are seeking a technically proficient Information Systems Security Engineer to support the security posture of our Network Infrastructure. In this role, you will implement and maintain comprehensive security measures to protect customer data, systems, and networks. This position plays an important role in ensuring security is integrated throughout the system lifecycle, from design through operation, supporting the mission while maintaining strong defensive measures.

Requirements

• Bachelor's degree in Computer Science, Cybersecurity, Information Technology, or a related field, or equivalent experience.
• 10+ years of related work experience with demonstrated ISSE/ISSO responsibilities, preferably within the Intelligence Community or DoD environment.
• Current TS/SCI with Polygraph (Required).
• Must meet DoD 8570/8140 IASAE Level II requirements (e.g., CISSP, CASP+, or CSSLP).
• Working knowledge of NIST 800-53 security controls and experience with RMF processes.
• Understanding of network protocols (TCP/IP, DNS, HTTP) and security concepts including VPNs, IDS/IPS, and DMZ configurations.
• Experience with A&A tracking tools such as Xacta or eMASS.
• Strong analytical, problem-solving, and communication skills with the ability to document technical security findings clearly.

Nice To Haves

• CISM, Security+, CCSP, or GSLC.
• CCNP Enterprise with the SD WAN, CCIE Security, JNCIS-ENT, JNCIP-ENT, or JNCIE-ENT
• Exposure to major firewall platforms (e.g., Palo Alto, Cisco ASA, Fortinet).
• Cisco Identity Services Engine (ISE), Juniper Contrail, Cisco DevNet, Juniper Automation, or other networking orchestration tool.
• Basic proficiency in Ansible, Python, PowerShell, or Bash for task automation.
• SIEM Experience

Responsibilities

• Contribute to the design and documentation of secure system architectures that meet mission requirements and security standards.
• Support Risk Management Framework (RMF) activities (Steps 1–6), assisting Information System Security Officers (ISSOs) in taking systems from initial categorization through Authorization to Operate (ATO).
• Develop and maintain Assessment & Authorization (A&A) documentation, including Systems Security Plans (SSP), Security Control Traceability Matrix (SCTM), and Body of Evidence (BoE).
• Designs security architectures from requirements phase, defining system security requirements, and integrating capabilities including Zero Trust Architecture Software Defined Networking (SDN), macro/micro-segmentation, and software-defined perimeter controls to enable continuous verification and minimize network attack surfaces.
• Participate in formal and informal design reviews to identify potential security weaknesses, deficiencies, and/or vulnerabilities in the design - evaluating designs for security impacts before implementation.
• Ensure hardware and software comply with Government Security Certification Officer (SCO) requirements and align with NIST SP 800-53, ICD 503, and CNSSI 1253 standards.
• Implement and maintain continuous monitoring (ConMon) activities using automated tools to track system health and compliance status.
• Perform risk assessments and security audits; use tools like Nessus (ACAS) and SCAP to identify, track, and remediate vulnerabilities.
• Assist with incident response activities and participate in on-call rotation for security incidents.
• Provide support for network mapping activities and system interdependencies to ensure secure data flow across the enterprise.

Benefits

• flexible time off
• robust learning resources
• competitive compensation
• competitive benefits
• learning and development opportunities
• comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior